Android Question Canvas coordinate

rossati · Feb 2, 2023

Hi
I am drawing an horizontal line at a fixed top coordinate in a canvas associated to a panel (B4A) and that line appears at differents levels depending oh the panel Height.
This means that the canvas coordinates are relative to the panel dimension??
Thanks

Brian Dean · Feb 2, 2023

... that line appears at differents levels depending oh the panel Height.

I think that we need to see your code. Canvas coordinates are not related to the canvas size. This code ...

B4X:

    Dim cvs As Canvas
    cvs.Initialize(Panel1)
    cvs.DrawLine(0, 15, 100%x, 15, xui.Color_Black, 2dip)
    Panel1.Invalidate

... will draw a horizontal line that is always the same distance (on the same device) from the top of Panel1 no matter what the height of Panel1.

emexes · Feb 3, 2023

rossati said:
and that line appears at differents levels depending oh the panel Height.

is that levels as in RGB intensity levels, or levels as in vertical displacements?

Android Question Canvas coordinate

rossati

Active Member

Brian Dean

Well-Known Member

emexes

Expert

Similar Threads

Android Question Canvas coordinate

rossati

Active Member

Brian Dean

Well-Known Member

emexes

Expert

Similar Threads

Privacy & Transparency

Privacy & Transparency